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annotate src/audio/baudio/SDL_beaudio.cc @ 3819:b225d9820ee3 SDL-ryan-multiple-audio-device

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Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and BeOS). None are tested, so anyu could fail to compile.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 06 Oct 2006 20:36:23 +0000
parents adf732f1f016
children 29e83f221c62
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to the audio stream on BeOS */
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25
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26 #include <SoundPlayer.h>
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27
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28 #include "../../main/beos/SDL_BeApp.h"
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29
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30 extern "C"
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31 {
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32
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33 #include "SDL_audio.h"
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34 #include "../SDL_audio_c.h"
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35 #include "../SDL_sysaudio.h"
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36 #include "../../thread/beos/SDL_systhread_c.h"
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37 #include "SDL_beaudio.h"
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38
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39 }
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40
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41
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42 static int BEAUDIO_Available(void)
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43 {
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44 return 1; /* Always available on BeOS. */
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45 }
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46
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47
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48 /* !!! FIXME: have the callback call the higher level to avoid code dupe. */
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49 /* The BeOS callback for handling the audio buffer */
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50 static void
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51 FillSound(void *device, void *stream, size_t len,
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52 const media_raw_audio_format & format)
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53 {
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54 SDL_AudioDevice *audio = (SDL_AudioDevice *) device;
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56 /* Silence the buffer, since it's ours */
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57 SDL_memset(stream, audio->spec.silence, len);
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58
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59 /* Only do soemthing if audio is enabled */
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60 if (!audio->enabled)
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61 return;
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62
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63 if (!audio->paused) {
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64 if (audio->convert.needed) {
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65 SDL_mutexP(audio->mixer_lock);
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66 (*audio->spec.callback) (audio->spec.userdata,
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67 (Uint8 *) audio->convert.buf,
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68 audio->convert.len);
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69 SDL_mutexV(audio->mixer_lock);
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70 SDL_ConvertAudio(&audio->convert);
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71 SDL_memcpy(stream, audio->convert.buf, audio->convert.len_cvt);
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72 } else {
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73 SDL_mutexP(audio->mixer_lock);
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74 (*audio->spec.callback) (audio->spec.userdata,
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75 (Uint8 *) stream, len);
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76 SDL_mutexV(audio->mixer_lock);
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77 }
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78 }
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79 }
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80
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81 static void
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82 BEAUDIO_CloseDevice(_THIS)
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83 {
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84 if (_this->hidden != NULL) {
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85 if (_this->hidden->audio_obj) {
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86 _this->hidden->audio_obj->Stop();
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87 delete _this->hidden->audio_obj;
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88 _this->hidden->audio_obj = NULL;
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89 }
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90
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91 delete _this->hidden;
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92 _this->hidden = NULL;
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93
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94 /* Quit the Be Application, if there's nothing left to do */
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95 SDL_QuitBeApp();
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96 }
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97 }
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98
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99 static int
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100 BEAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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101 {
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102 int valid_datatype = 0;
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103 media_raw_audio_format format;
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104 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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105
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106 /* Initialize all variables that we clean on shutdown */
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107 _this->hidden = new SDL_PrivateAudioData;
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108 if (_this->hidden == NULL) {
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109 SDL_OutOfMemory();
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110 return 0;
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111 }
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112 SDL_memset(_this->hidden, 0, (sizeof *_this->hidden));
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113
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114 /* Initialize the Be Application, if it's not already started */
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115 if (SDL_InitBeApp() < 0) {
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116 return 0;
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117 }
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118
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119 /* Parse the audio format and fill the Be raw audio format */
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120 memset(&format, '\0', sizeof(media_raw_audio_format));
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121 format.byte_order = B_MEDIA_LITTLE_ENDIAN;
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122 format.frame_rate = (float) this->spec.freq;
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123 format.channel_count = this->spec.channels; /* !!! FIXME: support > 2? */
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124 while ((!valid_datatype) && (test_format)) {
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125 valid_datatype = 1;
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126 this->spec.format = test_format;
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127 switch (test_format) {
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128 case AUDIO_S8:
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129 format.format = media_raw_audio_format::B_AUDIO_CHAR;
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130 break;
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131
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132 case AUDIO_U8:
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133 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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134 break;
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135
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136 case AUDIO_S16LSB:
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137 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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138 break;
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139
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140 case AUDIO_S16MSB:
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141 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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142 format.byte_order = B_MEDIA_BIG_ENDIAN;
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143 break;
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144
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145 case AUDIO_S32LSB:
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146 format.format = media_raw_audio_format::B_AUDIO_INT;
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147 break;
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148
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149 case AUDIO_S32MSB:
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150 format.format = media_raw_audio_format::B_AUDIO_INT;
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151 format.byte_order = B_MEDIA_BIG_ENDIAN;
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152 break;
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153
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154 case AUDIO_F32LSB:
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155 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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156 break;
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157
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158 case AUDIO_F32MSB:
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159 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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160 format.byte_order = B_MEDIA_BIG_ENDIAN;
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161 break;
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162
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163 default:
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164 valid_datatype = 0;
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165 test_format = SDL_NextAudioFormat();
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166 break;
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167 }
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168 }
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169
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170 format.buffer_size = this->spec.samples;
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171
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172 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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173 SDL_SetError("Unsupported audio format");
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174 return 0;
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175 }
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176
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177 /* Calculate the final parameters for this audio specification */
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178 SDL_CalculateAudioSpec(&this->spec);
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179
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180 /* Subscribe to the audio stream (creates a new thread) */
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181 sigset_t omask;
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182 SDL_MaskSignals(&omask);
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183 _this->hidden->audio_obj = new BSoundPlayer(&format, "SDL Audio",
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184 FillSound, NULL, _this);
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185 SDL_UnmaskSignals(&omask);
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186
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187 if (_this->hidden->audio_obj->Start() == B_NO_ERROR) {
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188 _this->hidden->audio_obj->SetHasData(true);
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189 } else {
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190 SDL_SetError("Unable to start Be audio");
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191 return 0;
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192 }
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193
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194 /* We're running! */
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195 return 1;
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196 }
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197
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198 static int
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199 BEAUDIO_Init(SDL_AudioDriverImpl *impl)
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200 {
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201 /* Set the function pointers */
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202 impl->OpenDevice = DSP_OpenDevice;
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203 impl->CloseDevice = DSP_CloseDevice;
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204 impl->ProvidesOwnCallbackThread = 1;
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205 impl->OnlyHasDefaultOutputDevice = 1;
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206
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207 return 1;
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208 }
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209
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diff changeset
210
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211 AudioBootStrap BEAUDIO_bootstrap = {
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212 "baudio", "BeOS BSoundPlayer",
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213 BEAUDIO_Available, BEAUDIO_Init, 0
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214 };
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215
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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216 /* vi: set ts=4 sw=4 expandtab: */